4.5 Safety characteristics of the safety system
4.5.1 Introduction
For using the optional safety technology module "T0", the ctrlX DRIVE
system has been certified according to IEC 61508, IEC 61800-5-2,
IEC 62061 and ISO 13849-1.
The risk assessment and risk reduction of a machine require the safety
functions of the individual components to be assessed. The interaction of the
components has to be taken into account, too. In addition to the systematic
suitability, it is also necessary to determine the total PFH value for the
machine or the machine part (e.g., a safety zone). The total PFH value allows
assessing whether the required "Safety Integrity Levels" (SIL
r
) or
"Performance Levels" (PL
r
) have been complied with. For the optional safety
technology module "T0", the paragraph below shows how to determine the
PFH value for a drive system and how to integrate additional external
components.
The manufacturer-independent software wizard "SISTEMA" is
suited for calculating the total PFH value.
You can procure SISTEMA libraries from our website.
For more information, please see the website of "Institut für
Arbeitsschutz der DGUV (IFA)" [Institute for Occupational Safety
and Health of the German Social Accident Insurance (IFA)].
There you can download the SISTEMA software free of charge.
Your advantages:
● Quickly calculating the Performance Level
● Easily and quickly accessing safety characteristics
● Safety characteristics for certified components
4.5.2 Optional safety technology module "T0"
Drives equipped with the optional safety technology module "T0" comply with
the following "Safety Integrity Level" (SIL) or "Performance Level" (PL):
● Up to SIL3 according to IEC 62061
● Up to Category 4, PL e according to ISO 13849-1
The ctrlX DRIVE system with the optional safety technology module "T0" has
the following safety characteristics:
Description ctrlX DRIVE
PFH
1),
<2×10
-9
1/h (2% SIL3) (preliminary)
Mission Time 175,200 h (20 years)
"Proof Test" interval 175,200 h (20 years)
MTTF
d/channel
1)
> 200 years (preliminary)
DC
avg
> 99 % (preliminary)
1) The specified safety characteristics refer to an average ambi‐
ent temperature of 40 °C (see also "Ambient and operating
conditions" in the Project Planning Manuals).
Tab. 4-7: Safety characteristics of the ctrlX DRIVE system with the optional
safety technology module "T0"
ctrlX SAFETY "Safe Torque Off" Safety Option in ctrlX DRIVE
21/65
System overview
R911383774_Edition 03 Bosch Rexroth AG
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